Product Description

A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between 2 shafts while allowing for angular misalignment, parallel offset and even axial motion, of 1 shaft relative to the other. This design utilizes a single piece of material and becomes flexible by removal of material along a spiral path resulting in a curved flexible beam of helical shape. Since it is made from a single piece of material, the Beam Style coupling does not exhibit thebacklash found in some multi-piece couplings. Another advantage of being an all machined coupling is the possibility to incorporate features into the final product while still keep the single piece integrity.

Changes to the lead of the helical beam provide changes to misalignment capabilities as well as other performance characteristics such as torque capacity and torsional stiffness. It is even possible to have multiple starts within the same helix.

 The material used to manufacture the beam coupling also affects its performance and suitability for specific applications such as food, medical and aerospace. Materials are typically aluminum alloy and stainless steel, but they can also be made in acetal, maraging steel and titanium. The most common applications are attaching encoders to shafts and motion control for robotics.

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Type Description Bore(mm)
BR D18L25 4~6.35
D20L25 4~8
D25L30 5~12
D32L40 8~16
DR D12L19 3~6
D16L24 3~6.35
D18L25 3~10
D25L30 5~14
BE D16L23 3~6
D18L25 3~6.35
D20L26 4~8
D25L31 5~12
D32L41 6~16

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clamp coupling

Temperature and Environmental Limits for Various Beam Coupling Materials

The temperature and environmental limits of beam coupling materials depend on their specific composition and properties. Different materials have varying degrees of resistance to temperature extremes, chemicals, humidity, and other environmental factors. Here are some common beam coupling materials and their associated temperature and environmental limits:

  • 1. Stainless Steel:

    Stainless steel beam couplings are known for their excellent mechanical properties and resistance to corrosion. They can typically operate within a wide temperature range, from -40°C to 300°C (-40°F to 572°F). Stainless steel is also resistant to most chemicals, making it suitable for various environments, including industrial and outdoor applications.

  • 2. Aluminum:

    Aluminum beam couplings offer lightweight construction and moderate mechanical properties. They have a more limited temperature range compared to stainless steel, typically operating between -20°C to 120°C (-4°F to 248°F). While aluminum has good corrosion resistance in certain environments, it is not as durable as stainless steel in harsh conditions.

  • 3. Brass:

    Brass beam couplings have reasonable mechanical properties and corrosion resistance. They are suitable for applications with temperatures ranging from -20°C to 100°C (-4°F to 212°F). Brass is more susceptible to corrosion in certain environments, so it is essential to consider the specific application’s conditions.

  • 4. Plastic/Polymer:

    Beam couplings made from plastic or polymer materials offer lightweight and cost-effective solutions. However, their temperature limits are more restricted compared to metal couplings. They typically operate between -30°C to 80°C (-22°F to 176°F). These couplings may not be suitable for high-temperature or chemically aggressive environments.

  • 5. Carbon Steel:

    Carbon steel beam couplings are known for their strength and mechanical properties. They generally operate between -40°C to 120°C (-40°F to 248°F). Carbon steel is vulnerable to corrosion, so it may not be ideal for applications in corrosive or humid environments without proper protection.

It’s crucial to consider the temperature and environmental conditions of your specific application when selecting a beam coupling material. Choosing a material that can withstand the intended operating conditions will ensure the longevity and reliable performance of the coupling.

Additionally, keep in mind that various beam coupling manufacturers may offer specific variations of materials with different properties and limits. Always refer to the manufacturer’s datasheets and technical documentation for precise information on the temperature and environmental limits of their beam coupling products.

clamp coupling

Materials Used in Manufacturing Beam Couplings

Beam couplings are commonly made from various materials, each offering unique properties that suit different application requirements. Some of the most common materials used in manufacturing beam couplings include:

  • Aluminum:

    Aluminum is a lightweight and cost-effective material commonly used in beam coupling construction. Aluminum beam couplings are ideal for applications where weight reduction is essential, such as in robotics or aerospace systems. They provide moderate mechanical strength and flexibility while offering good resistance to corrosion.

  • Stainless Steel:

    Stainless steel is a popular choice for beam couplings due to its excellent mechanical properties and high corrosion resistance. Stainless steel couplings are well-suited for demanding applications that require strength, durability, and resistance to harsh environments. They are commonly used in industries such as food processing, medical equipment, and marine applications.

  • Brass:

    Brass is a material known for its good electrical conductivity and moderate strength. Brass beam couplings are suitable for specific applications that require electrical grounding or where non-magnetic properties are essential. However, compared to stainless steel or aluminum, brass couplings may have slightly lower mechanical strength and corrosion resistance.

  • Plastic/Polymer:

    Plastic or polymer beam couplings are chosen for their lightweight and cost-effective nature. They are often used in applications where weight reduction is critical, and they offer electrical insulation properties. However, plastic couplings may have lower mechanical strength compared to metal couplings and are not suitable for high-torque applications or extreme environmental conditions.

  • Carbon Steel:

    Carbon steel is a robust and widely used material for beam couplings. Carbon steel couplings offer good mechanical strength and are suitable for various industrial applications. However, they may not provide the same level of corrosion resistance as stainless steel and may require proper maintenance to prevent rusting.

The choice of material depends on the specific needs of the application, including factors such as required strength, weight constraints, environmental conditions, and corrosion resistance. Manufacturers often provide a range of material options for their beam couplings to accommodate diverse industrial and commercial uses.

clamp coupling

Differences between Single-Beam and Multi-Beam Couplings

Single-beam and multi-beam couplings are two common types of beam couplings used in motion control applications. While they both provide flexibility for misalignment compensation, they have distinct differences in design and performance. Let’s explore these differences:

  • Structure:

    A single-beam coupling consists of a single helical beam that connects the two shafts. It is a straightforward design with a single helix providing angular misalignment compensation. On the other hand, a multi-beam coupling has multiple helical beams arranged in parallel around the circumference of the coupling. The multiple beams increase its flexibility and enable compensation for angular, axial, and parallel misalignment.

  • Misalignment Compensation:

    Both single-beam and multi-beam couplings are capable of compensating for misalignment between connected shafts. However, the level of compensation differs between the two types. Single-beam couplings are more suitable for applications with primarily angular misalignment. They can handle small amounts of axial and parallel misalignment but are less effective than multi-beam couplings in this regard. Multi-beam couplings, with their multiple beams, can efficiently accommodate more extensive misalignment in all three axes, making them suitable for applications with more complex misalignment requirements.

  • Torsional Rigidity:

    Single-beam couplings typically have lower torsional rigidity compared to multi-beam couplings. This means that single-beam couplings may exhibit slightly more torsional flexibility and compliance under torque compared to their multi-beam counterparts. As a result, multi-beam couplings are often preferred in applications where high torsional rigidity is essential to maintain precise motion control and minimize backlash.

  • Applications:

    The choice between single-beam and multi-beam couplings depends on the specific requirements of the application. Single-beam couplings are commonly used in applications where space is limited, and primarily angular misalignment needs to be compensated. They are suitable for less demanding misalignment scenarios and can be found in various motion control systems, including small automation machinery and robotics.

    Multi-beam couplings are chosen for applications that require more comprehensive misalignment compensation. They excel in situations where misalignment can occur in multiple axes and are often used in precision motion control systems, optical equipment, and applications with high torsional rigidity and accuracy requirements.

In summary, single-beam and multi-beam couplings both offer flexibility for misalignment compensation in motion control systems. Single-beam couplings are simple, space-efficient, and suitable for applications with primarily angular misalignment. On the other hand, multi-beam couplings provide enhanced misalignment compensation in all three axes and offer higher torsional rigidity, making them ideal for precision applications with more complex misalignment requirements.

China Professional Standard Steel Flexible Tubular Helical Beam Couplings  China Professional Standard Steel Flexible Tubular Helical Beam Couplings
editor by CX 2024-05-10